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英語 高校生

答えとなんでそうなるのか解説をお願いしたいです。

ngeao1ox defgnd 41 Don't throw the textbook away. You ( 0 should be ) need it later. must be ③ might can 42 “I saw Mr. Yamada at Shinjuku Station this morning." Coo"You ( )have. He's still on vacation in Hawaii." の couldn't ② didn't ③ might ④ should 43 His name is known ( )many baseball fans. ④ between の for 2 with ③ to 44 She( ) to America three times when she was a college student. 3 would go went 2 has gone の used to go 45 It's our wedding anniversary next Tuesday, and by then we ( )married for ten years. O are O will have O will have been would have 46 Five people ( )in the car crash. 2 injured 08イo0 sd ③ injury O injure were injured 47 Saki, why don't you take some time off? You ( b) too hard lately. u 0 would work ② have been working ③ had worked ④ should have worked 48 I don't know if he ( )us next Sunday. 0 will have visited ud ② will visit ed ③ visits #d Tsohoo の visit 49 “Do you know what Junko is doing?” “Well, she ( )a book whenI saw her a while ago." o has been reading b@ is reading O may be reading O was reading 50 Nobody could deny that he ( as a famous painter. O was の had been known O knew @ know iw eta ) be in because I can hear his radio. 3 has ④ must 51 He( ① shall 2 must have ) reality. 52 George must be mad ( ① face ② facing 3 to be face の to face since I left my home to work in this city. O has passed @ have passed @ is passed 53 Ten years o had passed warm in the room. 54 Bill kept his coat on, although it ( ④ must be O is 2 was ③ has been 4

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数学 高校生

(2)の解の個数のとこがわかりません! どう考えたら、このような個数になるんですか??

重要例題I26 三角方程式の解の個数 OO aは定数とする。0S0<2π のとき, 方程式 sin°0-sin0=aについ (1) この方程式が解をもつためのaのとりうる値の範囲を求めよ。 (2) この方程式の解の個数をaの値によって場合分けして求めよ。 CHART OLUTION 方程式f(0)=a の解 2つのグラフy=f(0), y=a の共有点 sin0=k (0S0<2元)の解の個数 k=±1 で場合分け 0の個数は k=±1 のとき 1個,-1<ん<1 のとき kく-1,1<kのとき 2個 0個 解答) (1) sin°0-sin0=a sin0=t とおくと ただし,0<0<2π から したがって,方程式のが解をもつための条件は,方程式 ② が3の範囲の解をもつことである。 方程式2の実数解は,2つの関数 t-t=a -1StS1 -0S0<2π の、 -1Ssin te 'snie nta 2 ソーパー=-)-yーa 2 ソ=a のグラフの共有点のt座標であるから, 1 2 図から -Kas2 O| 1 4 (2) (1) の2つの関数のグラフの共有点の t座標に注目すると, 方程式0の解の個数は, 次のように場合分けされる。 [1] a=2 のとき, t=-1 から [2] 0<a<2 のとき, -1<tく0 から [3] a=0 のとき,t=0, 1 から 1個 s t sin0=t を 全 値の個数は, に対して 2個 3個 t=±1 のと [4] -<a<0 のとき, 0<t<1 に交点が2個存在し, そ -1くt<1 の れぞれ2個ずつの解をもつから 4個 =ー- のとき, t=から 2個 15 a=-- 2 [6] a<--, 2<a のとき 0個 4' ス

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英語 高校生

この問題の5と6を教えて欲しいです

U4 Track 20 A ある動物園のホームページに,お知らせがでています。 We need a name for the baby elephant! Jmob yortl hob ahteDule yall0 VnM On the morning of June 1, a baby African elephant was born at our zoo. He is a healthy male elephant. Our zoo is having a contest to find a good name for the new baby. hre Tol erobmy ovyor About the baby elephant 5 He weighs 80 kilograms, and is a little small for a normal new-born baby. The mother, named Pao, has given birth to three babies before. We are now having public viewings of him on a TV monitor, but you have to wait until August to see ) him directly. Tobaou) Smoite 0 Entry Naming Contest Entry Rules 1) Click on the “Entry” button on the right. Then write your name for the baby, then press the "Confirm” button to submit your entry form. 文の 2) You can apply only one time. Please submit just one name for the baby on the entry form. 3) The deadline is August 1, 1 p.m. は法ム のmadT ニ pninstei 4)oThe selected name for the baby will be announced on our homepage on 文美 August 20. obno.1 liw onslq tuoY () ) adT (S) ) CSTICCjCq" If the name is selected, the person will receive 500 dollars. The winner will be Prizes allowed to ride on the father elephant in ea parade. We are going to have the parade to celebrate our 100th anniversary in September. oThere may be some people who submitted the selected name. In that case the first person will be the winner. notes give birth to ~を出産する entry 入り口,参加登録 entry formは, 入カフォーム。 confirm (正しいと)確かめる ホームページの入カフォームにある「確 認ボタン」。 apply 申し込む submit 提出する deadline celebrate

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